I remember when my cousins the dairy farmers presented my cousins the health food devotees with a nice big bottle of moo juice fresh from the farm. It spilled all over the back of their car, on a warn June day, and it didn't take more than an hour to stink. Then there was the time I went to Maryland with a couple of friends. The guy we were driving with picked up a bushel of crabs for his mum. A week later you could still smell the car before you saw it.
Of course if you can find an unneutered male cat, eu de tom is extremely pungent and it stays!
But here's my suggestion. Take one tablespoon of, ordinary white sugar, sand, unmoistened concrete, or equally troublesome substance and sprinkle, liberally, around the gas cap. Take one bag that formerly held five pounds of the same troublesome substance and leave it beside the gas cap. Pray to the God of Garages that your victim's mechanic is a crook, and enjoy it.